Changeable-speed and reversible friction-gearing.



No. 663,940. Patented Dec. I8, |900.

' J. W'. &. 0. P. SHAVEB.

CHANGEABLE SPEED AND REVERSIBLE FRICTION BEARING,V

(Application med nays, 1899.)

(un Model.)

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NiTED STATES JOHN W. SHAVER AND OLVER P. SHAVER, OF FRIEDENS, PENNSYLVANIA.

CHANGEABLE-SPEED AND REVERSIBLE FRICTION-GEARING.

SPECIFICATION forming part of Letters Patent N0. 663,940, dated December 18, 1900.

Application filed May 3. 1899.

To cir/ZZ whom 25 19m/y concern.-

Beit known that we, JOHN W. SHAVER and OLIVER P. SHAVER, citizens of the United States, residing at Friedens, in the county of Somerset and State of Pennsylvania, have invented new and useful Improvements in Changeable-Speed and Reversible Friction- Gearing, of which the following is a specification.

This invention relates to changeable-speed and reversible gearing; and the object is to provide friction-gearing of simple and effective design adapted for use on all classes of machinery for either varying the speed or reversing the motion.

With traction or motor vehicles, engines, and the like it is frequently desirable to change the speed temporarily, as when pass ing over an obstruction or rut, without interfering with the initial actuating power and also to reverse the direction of running for back motion, and it is to provide mechanism for accomplishing these results that our invention is particularly directed.

The invention consists in the novel struc tural details and combination and arrangement of parts hereinafter fully described and claimed and illustrated by the accompanying drawings, in which-n Figure lis a plan view of gearing embodying our invention. Fig. 2 is a section on line 2 2 of Fig. l. Fig. 3 is a longitudinal section of the drive-gear and adju-sting mechanism. Fig. 4 is a section on line 4 4 of Fig. l. Fig. 5 is an elevation of the driving-gear-shifting mechanism, and Fig. 6 is a cross-section thereof on line 6 6 of Fig. l. Figs. 7 and 8 are elevations of the shifting levers.

A is the drive-shaft, and movable longitudinally thereon and rotatable therewith is sleeve B, carrying the oppositely-disposed bevel-gears C and C. OollarsD are arranged on one end of the sleeve and projected therebetween is shifting fork E, carrying antifriction-rollers F. Said fork projects from rackbar G, movable longitudinally in guides H, through the medium of pinion t' on shaft l, the latter at its opposite end carrying pinion t, which meshes with segment J, carrying shifting lever J K is the driven gear adapted for frictional engagement with gears C O', said gear being Serial No. 715,427. (No model.)

l movable on driven shaft L, which is of angular section, to rotate therewith. Arranged about shaft L, but not rotatable therewith, is sleeve M, having cup-head M to receive ball-bearings N, upon which gear K rotates, the cup being closed by annular flange K on the back of the gear. Movable on sleeve M is a second sleeve O, and confined on the formerbetween the extremity of sleeve O and cup M is expansible coiled spring P, which holds sleeve M and gear K projected, with the latter frictionally engaging either of gears O or O. Rack Q on sleeve O is engaged bypinion r on shaft R, the latter at its opposite end carrying pinion r', which meshes with vsegment S, carrying shifting lever S. Levers J' and S are of like form and move in the same direction when adj usting the gearing. Sleeve O moves between rolls U and guide-plate V and is held by the latter against rotation.

To vary the speed, sleeve B, carrying gears O and C, is moved either toward or away from shaft L, so as to engage either a wide or narrow portion of the circumference of gear C with gear K, spring P permitting the latter to move longitudinally in conformity with the movement of gear O and holding the same with pressure suiiicient to maintain a proper frictional engagement. The springis moved longitudinally by the described adjusting mechanism, so that it exerts unvarying pressure in the different adjustments of gears K and C. By shifting gear O into engagement with gear K the direction of rotation of the latter and of shaft L is reversed.

Gears C and O' are of corresponding peripheral width or thickness as gear K,.and in practice they are made no thicker or Wider than is`"necessa1'y to embrace the requisite range of adjustment, thus avoiding superduous engaging surfaces. With the gears proportioned as described and shown each of the engaging gears has exactly the same width of engaging surface and exactly the same width of inactive surface.

Gears C and C are designed to be of cast metal and gear K of paper, this combination making most effective friction-gearing; but we do not limit ourselves thereto orto the shown and described gear-adjusting mechanisms, as all these are structural features which may be changed or varied in many particu- IOO lars without departing from the spirit or scope of our invention.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. Improved changeable-speed and reversible gearing, including two shafts, separated rigidly connected and oppositely beveled friction-gears on one shaft, with means for longitudinally adjusting said gears, a single beveled gear on the other shaft and having position between the first-mentioned gears and adapted to frictionally engage either of them, and means for adjusting longitudinally said single beveled gear, substantially as shown and described.

2. An improved gearing com prisin ga driveshaft, a sleeve thereon carrying a bevel-gear, the sleeve being provided with separated collars, a longitudinally-movable adjusting-fork extending between the sleeve-collars, antifriction rollers on the fork engaging the sleeve-collars, and a driven shaft carrying a bevel-gear, substantially as shown and described.

3. An improved gearing comprising a driveshaft, a bevel friction-gear rotatable therewith and movable longitudinally thereon, a driven shaft at right angles to the drive-shaft and having fixed position with relation theret0, a bevel friction-gear rotatable with and adjustable on the driven shaft, anon-rotatable sleeve embracing the driven shaft, an antifriction bearing interposed between the sleeve and driven gear, and a spring coiled about the sleeve and acting thereon to force the sleeve and gear toward the drive-gear and to hold the gears in frictional engagement, substantially as shown and described.

4. An improved gearing comprising a driveshaft, a bevel friction-gear rotatable therewith and movable longitudinally thereon, a driven shaft at right angles to the drive-shaft, a bevel friction-gear rotatable with and adjustable longitudinally on the driven shaft, a sleeve embracing the driven shaft, said sleeve being formed with an end enlargement in the form of a cup to receive a ball-bearing for engaging the back of the driven gear, a spring coiled about the sleeve and lat one end engaging the said cup, a sleeve against which the rear c nd of the spring bears, and means for longitudinally moving said sleeve, substantially'as shown and described.

5. Improved changeable-speed and reversible gearing, including two shafts, separated rigidly connected and oppositely beveled gears longitudinally adjustable on one of the shafts, a single beveled gear between the rst-mentioned gears and longitudinally adj ustable on the other shaft, all of the gears having uniform peripheral width, substantially as and for the purpose herein described and shown.

In testimony whereof we have hereunto set our hands in presence of two subscribing witnesses.

JOHN W. SHAVER. OLIVER P. SHAVER. Witnesses:

W. P. REESE,

MARY OPPERMAN. 

